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AI has already changed weather forecasting forever.
It’s been a wild few years in the typically tedious world of weather predictions. For decades, forecasts have been improving at a slow and steady pace — the standard metric is that every decade of development leads to a one-day improvement in lead time. So today, our four-day forecasts are about as accurate as a one-day forecast was 30 years ago. Whoop-de-do.
Now thanks to advances in (you guessed it) artificial intelligence, things are moving much more rapidly. AI-based weather models from tech giants such as Google DeepMind, Huawei, and Nvidia are now consistently beating the standard physics-based models for the first time. And it’s not just the big names getting into the game — earlier this year, the 27-person team at Palo Alto-based startup Windborne one-upped DeepMind to become the world’s most accurate weather forecaster.
“What we’ve seen for some metrics is just the deployment of an AI-based emulator can gain us a day in lead time relative to traditional models,” Daryl Kleist, who works on weather model development at the National Oceanic and Atmospheric Administration, told me. That is, today’s two-day forecast could be as accurate as last year’s one-day forecast.
All weather models start by taking in data about current weather conditions. But from there, how they make predictions varies wildly. Traditional weather models like the ones NOAA and the European Centre for Medium-Range Weather Forecasts use rely on complex atmospheric equations based on the laws of physics to predict future weather patterns. AI models, on the other hand, are trained on decades of prior weather data, using the past to predict what will come next.
Kleist told me he certainly saw AI-based weather forecasting coming, but the speed at which it’s arriving and the degree to which these models are improving has been head-spinning. “There's papers coming out in preprints almost on a bi-weekly basis. And the amount of skill they've been able to gain by fine tuning these things and taking it a step further has been shocking, frankly,” he told me.
So what changed? As the world has seen with the advent of large language models like ChatGPT, AI architecture has gotten much more powerful, period. The weather models themselves are also in a cycle of continuous improvement — as more open source weather data becomes available, models can be retrained. Plus, the cost of computing power has come way down, making it possible for a small company like Windborne to train its industry-leading model.
Founded by a team of Stanford students and graduates in 2019, Windborne used off-the-shelf Nvidia gaming GPUs to train its AI model, called WeatherMesh — something the company’s CEO and co-founder, John Dean, told me wouldn’t have been possible five years ago. The company also operates its own fleet of advanced weather balloons, which gather data from traditionally difficult-to-access areas.
Standard weather balloons without onboard navigation typically ascend too high, overinflate, and pop within a matter of hours (thus becoming environmental waste, sad!). Since it’s expensive to do launches at sea or in areas without much infrastructure, there’s vast expanses of the globe where most balloons aren’t gathering any data at all.
Satellites can help, of course. But because they’re so far away, they can’t provide the same degree of fidelity. With modern electronics, though, Windborne found it could create a balloon that autonomously changes altitude and navigates to its intended target by venting gas to descend and dropping ballast to ascend.
“We basically took a lot of the innovations that lead to smartphones, global satellite communications, all of the last 20 years of progress in consumer electronics and other things and applied that to balloons,” Dean told me. In the past, the electronics needed to control Windborne’s system would have been too heavy — the balloon wouldn’t have gotten off the ground. But with today’s tiny tech, they can stay aloft for up to 40 days. Eventually, the company aims to recover and reuse at least 80% of its balloons.
The longer airtime allows Windborne to do more with less. While globally there are more than 1,000 conventional weather balloons launched every day, Dean told me, “We collect roughly on the order of 10% or 20% of the data that NOAA collects every day with only 100 launches per month.” In fact, NOAA is a customer of the startup — Windborne already makes millions in revenue selling its weather balloon data to various government agencies.
Now, with a potentially historic hurricane season ramping up, Windborne has the potential to provide the most accurate data on when and where a storm will touch down.
Earlier this year, the company used WeatherMesh to run a case study on Hurricane Ian, the Category 5 storm that hit Florida in September 2022, leading to over 150 fatalities and $112 billion in damages. Using only weather data that was publicly available at the time, the company looked at how accurately its model (had it existed back then) would have tracked the hurricane.
Very accurately, it turns out. Windborne’s predictions aligned neatly with the storm’s actual path, while the National Weather Service’s model was off by hundreds of kilometers. That impressed Khosla Ventures, which led the company’s $15 million Series A funding round earlier this month. “We haven’t seen meaningful innovation in weather since The Weather Channel in the 90s. Yet it’s a $100 billion market that touches essentially every industry,” Sven Strohband, a partner and managing director at Khosla Ventures, told me via email.
With this new funding, Windborne is scaling up its fleet of balloons as it prepares to commercialize. The money will also help Windborne advance its forecasting model, though Dean told me robust data collection is ultimately what will set the company apart. “In any kind of AI industry, whoever has the top benchmark at any given time, it’s going to fluctuate,” Dean said. “What matters is the model plus the unique datasets.”
Unlike Windborne, the tech giants with AI-based weather models — including, most recently, Microsoft — aren’t gathering their own data, instead drawing solely on publicly accessible information from legacy weather agencies.
But these agencies are starting to get into the game, too. The European Centre for Medium-Range Weather Forecasts has already created its own AI-based model, the Artificial Intelligence/Integrated Forecasting System, which it runs in parallel to its traditional model. NOAA, while a bit behind, is also looking to follow suit.
“In the end, we know we can't rely on these big tech companies to just keep developing stuff in good faith to give to us for free,” Kleist told me. Right now, many of the top AI-based weather models are open source. But who knows if that will last? “It's our mission to save lives and property. And we have to figure out how to do some of this development and operationalize it from our side, ourselves,” Kleist said, explaining that NOAA is currently prototyping some of its own AI-based models.
All of these agencies are in the early stages of AI modeling, which is why you likely haven’t noticed weather predictions making a pronounced leap in accuracy as of late. It’s all still considered quite experimental. “Physical models, the pro is we know the underlying assumptions we make. We understand them. We have decades of history of developing them and using them in operational settings,” Kleist told me. AI-based models are much more of a black box, and there’s questions surrounding how well they will perform when it comes to predicting rare weather events, for which there might be little to no historical data for the model to reference.
That hesitation might not last long, though. “To me it’s fairly obvious that most of the forecasts that would actually be used by users in the future will come from machine learning models,” Peter Dueben, head of Earth systems modeling at the European Centre for Medium Range Weather Forecasting, told me. “If you just want to get the weather forecast for the temperature in California tomorrow, then the machine learning model is typically the better choice,” he added.
That increased accuracy is going to matter a lot, not just for the average weather watcher, but also for specific industries and interest groups for whom precise predictions are paramount. “We can tailor the actual models to particular sectors, whether it's agriculture, energy, transportation,” Kleist told me, “and come up with information that's going to be at a very granular, specific level to a particular interest.” Think grid operators or renewable power generators who need to forecast demand or farmers trying to figure out the best time to irrigate their fields or harvest crops.
A major (and perhaps surprising) reason this type of customization is so easy is because once AI-based weather models are trained, they’re actually orders of magnitude cheaper and less computationally intensive to run than traditional models. All of this means, Kleist told me, that AI-based weather models are “going to be fundamentally foundational for what we do in the future, and will open up avenues to things we couldn't have imagined using our current physical-based modeling.”
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On sparring in the Senate, NEPA rules, and taxing first-class flyers
Current conditions: A hurricane warning is in effect for Mexico as the Category 1 storm Flossie approaches • More than 50,000 people have been forced to flee wildfires raging in Turkey • Heavy rain caused flash floods and landslides near a mountain resort in northern Italy during peak tourist season.
Senate lawmakers’ vote-a-rama on the GOP tax and budget megabill dragged into Monday night and continues Tuesday. Republicans only have three votes to lose if they want to get the bill through the chamber and send it to the House. Already Senators Thom Tillis and Rand Paul are expected to vote against it, and there are a few more holdouts for whom clean energy appears to be one sticking point. Senator Lisa Murkowski of Alaska, for example, has put forward an amendment (together with Iowa Senators Joni Ernst and Chuck Grassley) that would eliminate the new renewables excise tax, and phase out tax credits for solar and wind gradually (by 2028) rather than immediately, as proposed in the original bill. “I don’t want us to backslide on the clean energy credits,” Murkowski told reporters Monday. E&E News reported that the amendment could be considered on a simple majority threshold. (As an aside: If you’re wondering why wind and solar need tax credits if they’re so cheap, as clean energy advocates often emphasize, Heatmap’s Emily Pontecorvo has a nice explainer worth reading.)
At the same time, Utah’s Senator John Curtis has proposed an amendment that tweaks the new excise tax to make it more “flexible.” The amendments are “setting up a major intra-party fight,” Politicoreported, adding that “fiscal hawks on both sides of the Capitol are warning they will oppose the bill if the phase-outs of Inflation Reduction Act provisions are watered down.” Senators have already defeated amendments proposed by Democrats Jeanne Shaheen of New Hampshire and John Hickenlooper of Colorado to defend clean energy and residential solar tax credits, respectively. The session has broken the previous record for most votes in a vote-a-rama, set in 2008, with no end in sight.
The Department of Energy on Monday rolled back most of its regulations relating to the National Environmental Policy Act, or NEPA, and published a new set of guidance procedures in their place. The longstanding NEPA law requires that the government study the environmental impacts of its actions, and in the case of the DOE, this meant things like permitting and public lands management. In a press release outlining the changes, the agency said it was “fixing the broken permitting process and delivering on President Trump’s pledge to unleash American energy dominance and accelerate critical energy infrastructure.” Secretary of Energy Chris Wright said the agency was cutting red tape to end permitting paralysis. “Build, baby, build!” he said.
Nearly 300 employees of the Environmental Protection Agency signed a letter addressed to EPA head Lee Zeldin declaring their dissent toward the Trump administration’s policies. The letter accuses the administration of:
“Going forward, you have the opportunity to correct course,” the letter states. “Should you choose to do so, we stand ready to support your efforts to fulfill EPA’s mission.” It’s signed by more than 420 people, 270 being EPA workers. Many of them asked to sign anonymously. In a statement to The New York Times, EPA spokesperson Carolyn Horlan said “the Trump EPA will continue to work with states, tribes and communities to advance the agency’s core mission of protecting human health and the environment and administrator Zeldin’s Powering the Great American Comeback Initiative, which includes providing clean air, land and water for EVERY American.”
At the fourth International Conference on Financing for Development taking place in Spain this week, a group of eight countries including France and Spain announced they’re banding together in an effort to tax first- and business-class flyers as well as private jets to raise money for climate mitigation and sustainable development. “The aim is to help improve green taxation and foster international solidarity by promoting more progressive and harmonised tax systems,” the office of Spanish Prime Minister Pedro Sanchez said in a statement. Other countries in the coalition include Kenya, Barbados, Somalia, Benin, Sierra Leone, and Antigua & Barbuda. The group said it will “work towards COP30 on a better contribution of the aviation sector to fair transitions and resilience.” Wopke Hoekstra, who heads up the European Commission for Climate, called for other countries to join the group in the lead-up to COP30 in November.
In case you missed it: Google announced on Monday that it intends to buy fusion energy from nuclear startup Commonwealth Fusion Systems. Of course, CFS will have to crack commercial-scale fusion first (minor detail!), but as The Wall Street Journal noted, the news is significant because it is “the first direct deal between a customer and a fusion energy company.” Google will buy 200 megawatts of energy supplied by CFS’s ARC plant in Virginia. “It’s a pretty big signal to the market that fusion’s coming,” CFS CEO Bob Mumgaard told the Journal. “It’s desirable, and that people are gonna work together to make it happen.” Google’s head of advanced energy Michael Terrell echoed that sentiment, saying the company hopes this move will “prove out and scale a promising pathway toward commercial fusion power.” CFS, which is backed by Bill Gates’ Breakthrough Energy Ventures, aims to produce commercial fusion energy in the 2030s.
All the public property owned by Britain’s King Charles earned a net profit of £1.15 billion ($1.58 billion) last year. The biggest source of income? Offshore wind leases.
It’s the largest facility of its kind of Europe and will immediately make the lithium-sulfur battery startup a major player.
Lyten, the domestic lithium-sulfur battery company, has officially expanded into the European market, announcing that it has acquired yet another shuttered Northvolt facility. Located in Gdansk, Poland, this acquisition represents a new direction for the company: Rather than producing battery cells — as Lyten’s other U.S.-based facilities will do — this 270,000 square foot plant is designed to produce complete battery energy storage systems for the grid. Currently, it’s the largest energy storage manufacturing facility in Europe, with enough equipment to ramp up to 6 gigawatt-hours of capacity. This gives Lyten the ability to become — practically immediately — a major player in energy storage.
“We were very convinced that we needed to be able to build our own battery energy storage systems, so the full system with electronics and switch gear and safety systems and everything for our batteries to go into,” Keith Norman, Lyten’s chief sustainability and marketing officer, told me. “So this opportunity became very, very well aligned with our strategy.”
The well-funded startup has been negotiating this transaction — which is expected to close in the third quarter — since Northvolt’s bankruptcy proceedings got underway at the end of last year. It marks the second time the company has snatched up an old Northvolt asset, the first being a Bay Area-based plant capable of producing 200 megawatt-hours of batteries that’s expected to begin operations late this year.
Lithium-sulfur batteries are an emerging technology yet to be deployed at scale. This chemistry — if perfected — has the potential to be much higher energy-density than lithium-ion, and doesn’t require costly critical minerals prone to supply chain volatility such as nickel, manganese, cobalt, and graphite. These are all key elements of lithium-ion batteries and are primarily refined in China, whereas sulfur — the key material in lithium-sulfur batteries — is cheap and abundant around the world. Right now, the Poland facility is set up to produce lithium-ion energy storage systems, but once it starts switching over production lines, it will become likely the first in the world to manufacture lithium-sulfur systems at scale.
Until now, Lyten has only owned assets in the U.S., touting that it sources “well over 80%” of its core battery components domestically. But according to Norman, the startup has always looked to Europe as another key market, as its focus revolves around building local supply chains, not just a U.S.-centric one. “We have a vision to be able to have both battery manufacturing and energy storage manufacturing in the U.S. and in Europe, so that we can localize both supply chains,” he explained to me.
In the short-term, however, the company will continue to build its battery capacity in the U.S., including a a gigafactory in Reno planned for 2027, while it focuses on energy storage in Europe. U.S.-made batteries will supply the Poland facility until Lyten’s hypothetical future Europe-based battery factories can ramp, Norman explained.
Immediately after the deal closes, Lyten will restart manufacturing in order to meet Northvolt’s preexisting contracts for lithium-ion systems. Then throughout this year and next, the startup will work to integrate its own lithium-sulfur production lines, ultimately offering customers both lithium-sulfur and lithium-ion energy storage options. The goal is to produce a gigawatt-hour of system capacity by sometime next year.
Offering two distinct energy storage systems reliant on different battery chemistries will work to Lyten’s advantage, Norman told me via email, giving the company “an incredible amount of flexibility to navigate market uncertainty, supply chain uncertainty, geopolitical uncertainty, and varied customer demands.”
The company’s eagerness to acquire shuttered facilities isn’t driven by turbulence in the current political climate, Norman said, but rather by “opportunistic” market circumstances. Yet I also can’t help but notice that this would be a promising way for Lyten to cost-effectively scale at a time when, Norman said, it’s still taking a “wait and see” approach to tariffs and other fluctuating policies that stand to impact the domestic buildout of energy infrastructure.
When I spoke with Norman back in April, right after Trump’s “Liberation Day” tariffs came into effect, he expressed concern over how they could lead to spiraling construction costs. Levies on steel and aluminum, for example, now stand at 50%, while imports from China are still subject to cumulative tariffs of at least 54%. As Norman told me then, “the energy transition is a manufacturing transition,” and Lyten itself is “a hard tech company that needs to build a lot of infrastructure.”
So while the finances of the Poland factory acquisition aren’t public, it’s probably safe to assume that scooping up prebuilt infrastructure from a defunct business, taking over production of tried-and-true lithium-ion-based technologies, and expanding into international markets are all cheap and prudent options in this economy.
In terms of demand for energy storage, Norman also mentioned that the market is hotter in Europe right now than in the U.S., making it an optimal place to kick off its new product line. The company expects to sell storage systems from the Poland plant into a variety of other international markets, as well. In December of last year, Lyten announced that it had received letters of interest from the U.S. Export-Import Bank totalling $650 million in financing to deploy lithium-sulfur energy storage systems in the Caribbean and other developing economies.
As the company expands, it’s on the hunt for even more facilities to grab. “We continue to see assets becoming available or potential capital investments that have already been made in battery manufacturing assets that are potentially coming on the market,” Norman told me. He’s got his eyes on all of it. “That’s a real big priority for us.”
Removing the subsidies would be bad enough, but the chaos it would cause in the market is way worse.
In their efforts to persuade Republicans in Congress not to throw wind and solar off a tax credit cliff, clean energy advocates have sometimes made what would appear to be a counterproductive argument: They’ve emphasized that renewables are cheap and easily obtainable.
Take this statement published by Advanced Energy United over the weekend: “By effectively removing tax credits for some of the most affordable and easy-to-build energy resources, Congress is all but guaranteeing that consumers will be burdened with paying more for a less reliable electric grid.”
If I were a fiscal hawk, a fossil fuel lobbyist, or even an average non-climate specialist, I’d take this as further evidence that renewables don’t need tax credits. The problem is that there’s a lot more nuance to the “cheapness” of renewables than snappy statements like this convey.
“Renewables are cheap and they’ve gotten cheaper, but that doesn’t mean they are always the cheapest thing, unsubsidized,” Robbie Orvis, the senior director of modeling and analysis at Energy Innovation, told me back in May at the start of the reconciliation process. Natural gas is still competitive with renewables in a lot of markets — either where it’s less windy or sunny, where natural gas is particularly cheap, or where there are transmission constraints, for example.
Just because natural gas plants might be cheaper to build in those places, however, doesn’t mean they will save customers money in the long run. Utilities pass fuel costs through to customers, and fuel costs can swing dramatically. That’s what happened in 2022 after Russia invaded Ukraine, Europe swore off Russian gas, and the U.S. rushed to fill the supply gap, spiking U.S. natural gas prices and contributing to the largest annual increase in residential electricity spending in decades. Winter storms can also reduce natural gas production, causing prices to shoot up. Wind and solar, of course, do not use conventional fuels. The biggest factor influencing the price of power from renewables is the up-front cost of building them.
That’s not the only benefit that’s not reflected in the price tags of these resources. The Biden administration and previous Congress supported tax credits for wind and solar to achieve the policy goal of reducing planet-warming emissions and pollution that endangers human health. But Orvis argued you don’t even need to talk about climate change or the environment to justify the tax credits.
“We’re not saying let’s go tomorrow to wind, water, and solar,” Orvis said. “We’re saying these bring a lot of benefitsonto the system, and so more of them delivers more of those benefits, and incentives are a good way to do that.” Another benefit Orvis mentioned is energy security — because again, wind and solar don’t rely on globally-traded fuels, which means they’re not subject to the actions of potentially adversarial governments.
Orvis’ colleague, Mike O’Boyle, also raised the point that fossil fuels receive subsidies, too, both inside and outside the tax code. There’s the “intangible drilling costs” deduction, allowing companies to deduct most costs associated with drilling, like labor and site preparation. Smaller producers can also take a “depletion deduction” as they draw down their oil or gas resources. Oil and gas developers also benefit from low royalty rates for drilling on public lands, and frequently evade responsibility to clean up abandoned wells. “I think in many ways, these incentives level the playing field,” O’Boyle said.
When I reached out to some of the clean energy trade groups trying to negotiate a better deal in Trump’s tax bill, many stressed that they were most worried about upending existing deals and were not, in fact, calling for wind and solar to be subsidized indefinitely. “The primary issue here is about the chaos this bill will cause by ripping away current policy overnight,” Abigail Ross Hopper, the CEO of the Solar Energy Industries Association, told me by text message.
The latest version of the bill, introduced late Friday night, would require projects to start construction by 2027 and come online by 2028 to get any credit at all. Projects would also be subject to convoluted foreign sourcing rules that will make them more difficult, if not impossible, to finance. Those that fail the foreign sourcing test would also be taxed.
Harry Godfrey, managing director for Advanced Energy United, emphasized the need for “an orderly phase-out on which businesses can follow through on sound investments that they’ve already made.” The group supports an amendment introduced by Senators Joni Ernst, Lisa Murkowski, and Chuck Grassley on Monday that would phase down the tax credit over the next two years and safe harbor any project that starts construction during that period to enable them to claim the credit regardless of when they begin operating.
“Without these changes, the bill as drafted will retroactively change tax policy on projects in active development and construction, stranding billions in private investment, killing tens of thousands of jobs, and shrinking the supply of new generation precisely when we need it the most,” Advanced Energy United posted on social media.
In the near term, wind and solar may not need tax credits to win over natural gas. Energy demand is rising rapidly, and natural gas turbines are in short supply. Wind and solar may get built simply because they can be deployed more quickly. But without the tax credits, whatever does get built is going to be more expensive, experts say. Trade groups and clean energy experts have also warned that upending the clean energy pipeline will mean ceding the race for AI and advanced manufacturing to China.
Godfrey compared the reconciliation bill’s rapid termination of tax credits to puncturing the hull of a ship making a cross-ocean voyage. You’ll either need a big fix, or a new ship, but “the delay will mean we’re not getting electrons on to the grid as quickly as we need, and the company that was counting on that first ship is left in dire straits, or worse.”